Loom shuttle



Oct. 29, 1946. J, VKAKUFMANNS JR I 2,410,383

LOOM SHUTTLE Filed Ja. ll, 1945 Patented Oct. 29, 1946 UNITED STATES PATENT i oFF-ics [ff .lohn J. Kaufmann, .l r., Greenville, S. C., assignor to Steel Heddle Manufacturing Company', Philadelphia, Ia., a corporation of Pennsylvania Application January 11, 1945, Serial No. 5'l'2`,34'5$f l Claims.

This invention relates to shuttles for looms, andit relates more particularly to the provision of improved means, in such shuttles, for maintaining the proper tension on the filling yarn as the shuttle is passed back and forth through successive sheds of the warp.

In the shuttles which are used in the modern types of automatic looms a threading'block is usually provided 'at one end of the'shuttle, which block is provided'with means for automatically causing the filling yarn to be threaded in the shuttle immediately after the bobbin has been replenished in the shuttle. Such threading blocks are made in various shapes and styles and in some instances, where it is desirable to conf a tension device, of the character aforesaid;

trol the tension of the filling thread more or less accurately, said threading blocks are provided, usually at the end thereof to which the filling thread is fed from the'bobbin to the threading block, with spring pressed members between which the thread travels as it passes to the chanT nel Vof the threading block, and thereby there is provided a uniform tension on the filling yarn as the shuttle passes from side to side of the loom in the operation thereof. p

i Various Aforms of such tension devices have heretofore been suggested, Yand it has lone been recognized, as adesideratumjo provide, in connection with the tension members, some means, or van arrangement thereof, whereby there Will bea tendency o f the filling yar'nt'o pass downwardly at the entrance end ofthe threading block,v to the end that there will be less vlikelihood of *ther shuttle becoming unthre'aded during the 'operation of the loom, by reason 'of overthrows or loops which sometimes occur upon the reversal of movement of the shuttle.` However, such devices or arrangements have not proved entirely satisfactory in use.V y j Y 'f'heprincipal objectithere'fore', of the present invention, is 'to provide anV improved form of ten-` sion device for automatically threading shuttles, vvhi'chis so `constructed and arranged as to cause thejfilling yarn topass downwardlyinto the low--y erportionof the thread Vchanneland to so main-y which will be simple and inexpensive in 'construction, which may be readily and easily `assembled in the threading'block, and which is adjustable therein without dismantling the same.

The nature and characteristic features of the invention will be more readily'understoodfrom the following descriptions taken in Acor'mection with the accompanying drawing forming part hereof, in which: 'n Figure 1 is a top or plan view of the threading end portion of a loom shuttle having a threading block mounted therein and provided' with a tension device embodying the main featuresofthe present invention; j., p Fig'. 2 `is an enlarged end elevationv of Vthethreading block detached from the shuttle,'illus' trating more particularly the constructionL and arrangement of the tension members which .are mounted therein; Fig. 3 is an enlarged longitudinal'section ofthe i threading block detached, the section being taken tai'ngSaidV yarn so'v that likelihood of unthreading of the shuttles from overthrows or loops will be greatly minimized.

A further object of the invention is to provide aftension device,'of the character aforesaid, in which the initial' threading of the shuttle will be greatly facilitated by reason "of the ease with which the filling thread will pass to' the proper location between' the t'ensionmembers A furtherobject of theV inventionv is Yto provide lFig. 4 is an enlarged horizontal section of a portion of the threading block, taken on the lirie dof Fig. 2; Fig is an enlarged horizontaljsectionbf a portion-of the threading block, taken on thve'li'n'e i Fig. 6 is an enlarged longitudinal fsection ofa portion ofthe threading block asshownfi'n' Fig '3' but illustrating amodlnedform eff tension ber. It should, of course' be understood 'that' tli r,def scription and drawing herein are illustrative merely, and that ,various rn'odificatons "and changes may be made in thewstructuredisclosed Without departing from the spirit of the invention.

Referring to the drawing, in the particular embodiment of the invention therein shown, the

'shuttle'body l0 is preferablymade of wood, and has theusual bobbin'chamber Il in which the bobbin l2 is held by the 'usual grippingV means (not shown), whereby it may be readily discharged therefrom and a new bobbin substituted as the fillingruns out from time to timef i" Y The shuttle body lll is also providedwith y.the usualside delivery eye I3 'for the passageofjth'e filling yarn ld. The vthreading block ll 5 comprises primarily a casting preferably made of metal',

either cast iron or brass as desired; Said block lhasits outer'side surfaces I6 and f ll prefer.v ably parallel withl each other, and its bottom surface i8 substantially atv right angles,theretcvn'."Ifhe body portion of the threading block I is fitted into a complementally shaped groove I9 in one end of the body portion IE) of the shuttle.

The body portion of the threading block I5 is provided with a longitudinal channel 2U through which the filling thread I4 passes to the side delivery eye I34 during the weaving operation and as said filling'yarn is laidA in the cloth.v

The threading block I5 may also -be provided with a rearwardly extending horn portion 24, and an intermediate horn portion 25 extending into the longitudinal channel of the threading block I5, said horn portion serving to assist in the initial threading of the block, and in the retention of the lling yarn therein after the threading operation has been completed.

At the inner end of the threading block I5, that is, the end disposed toward the bobbin, there is mounted a pair of tension members 26. The inner end of the threading block I'I is recessed vertically, as at 28, for the mounting of said tension members 26 therein.

.The lower ends' of the tension members are eachprovided with a suitable aperture 29 through which extends a pin 3i) mounted in the lower portion in the inner end of the threading block I5. The upper end lof each of the tension membes is 'bent .over as at 3l to provide lug like extensions '32 which are positioned respectively in suitable apertures 33 provided in the inner end of thethreading block I5. In this manner the tensioiimembers 26 are guided at both the top and the bottom. A

For the purpose of imparting the required tension to the members 26 so that the same will grip the filling yarn and function in the desired manner. ashereinafter set forth, there are provided coil springs 34 which are positioned in the inner endsl of the hollow screws 35. The hollow screws 35 are threaded in the side walls of the threading block I5 in alinement with the pin 3i) at the bottom and the guiding apertures 32 at the top. The hollow screws 35thusserve to provide means for regulating the degree of tension on the members 25 The co-acting faces of the tension members 2B are preferably made flat, as hasy been the practice heretofore, but in the present .instance said coacting faces of the tension members are tapered toward the bottom 'for a purpose to be presently eirplain'eid.'lv The tension members may, of course, be'providedwith the usual side flanges all at either theentrancc side `or on the other Vside thereofjas at jlll. `.'Ihe essential requirement in connection with the present invention is that the co-acting faces of' the tension members be tapered' toward the. bottom.

` Preferably the flanges 40 vat the entrance side overlap the sides of the slot 28, in which the tension membersZB are positioned, and extend into recesses 43.in the inner end face of the threading block. Also the flanges 4U are preferably disposed parallel to theY vertical axis of the tension 4. the other edge thereof. This arrangement will tend to facilitate the passing of the filling thread to the proper location between the tension members when the threading action takes place. This arrangement will also serve to increase the efciency of the tension device and reduce the likelihoodof breakage ofl the fillingy thread from knots or unevenness therein. l .f

In the modified form of the invention shown in Fig. 6 of thc drawing the face portion of the tension member 25a is tapered from the top to the bottom by providing an inclination along each of the side edges thereof, and in this manner the degree of the taper may be increased. In this instance the flange lia will also be reversely tapered.

In either of the foregoing arrangements the filling yarn, as it travels between the tension members, will be caused to pass downwardly by reason of its natural inclination to take the path of least resistance and to position itself where the width of the tension members is less. Furthermore, the reverse taper of the portions 44 will assist in causing the filling thread to be impelled downwardly as it runs through the threading block. Y

4Iclaim:

1. In a loom shuttle of the automatic threading type a tension device comprising a pair of spring pressed tension members between which the filling yarn passes, said tension members havingiiat coacting faces tapered from the top toward the bottom.

2.- In a loom shuttle of the automatic threading type having a threading block mounted in one end thereof which threading block is provided with' a longitudinal thread channel through which the filling yarn passes from the bobbin to the outlet and spring pressed tension members mounted in the` threading blockbetween which the' llingyarn passes, said tension members having their coacting faces tapered from the top to- War'dvthe bottom and having reversely tapered portions along their entrance sides.

membrersand are connected to the main face portions thereof by inclined and reversely tapered portions 44- I t shouldfalso be noted that the flanges 4U along the entrance sides of the tension members 26 arc disposed at a somewhat greater distance from the vertical plane which passes through the 'elites of the coil' springs than are the flanges 4I along the opposite sides of said tension members. In this manner the'pressure exerted alongthe edge at which the filling thread enters the threading block will be considerably less than along 3. In a loom shuttle of the automatic threading type having a 'threading block mounted in one end thereofwhich threading block is provided with a longitudinal thread channel through which the lling yarn passes from the bobbin to the outlet and springlpressed tension vvmembers mounted in the threading block between which the fllling yarn passes, said tension members having" their coactingfaces tapered from the top toward the bottom and having flanges along their entrancesides connected to the face portions by reversely tapered portions.

4. In a loom shuttle of the automatic threading type having having a threading block mounted in one end thereof which threading block is provided with a longitudinal thread channel through whichtheA filling 'yarn passes from the bobbin to the outlet 'and spring pressedV tension memfbers'mounted in the threading block between which the lling yarn passes, said tension members having their coacting faces tapered from the top toward the bottom and having flanges along their sides.

.5. In a loom shuttle of the automatic threading type having a threading block mounted .in one end thereof, which threading block is' provided with a longitudinal thread channel through which the filling. yarn passes yfro-In the bobbin to the outlet, and spring "pressed tension members l mounted in the threading blockbetween which the filling yarn passes. said tension members having flat coacting faces tapered from the top to- Ward the bottom.

6. In a loom shuttle of the automatic threading type having a threading block mounted in one end thereof, Which threading block is provided with a longitudinal thread channel through which the filling yarn passes from the bobbin to the outlet, and spring pressed tension members mounted in the threading block between which the filling yarn passes, said tension members having their coacting faces tapered from the top toward the bottom and having the edges along the entrance sides thereof disposed a greater distance from the point of application of the spring pressure than the edges along the opposite sides thereof.

7. 'In a loom shuttle of the automatic threading type having a threading block mounted in one en'd thereof, Which threading block is provided with a longitudinal thread channel through which the lling yarn passes from the bobbin to the outlet, and spring pressed tension members mounted in the theading block between which the illling yarn passes, said tension members having their coacting faces tapered from the top toward the bottom and having flanges along the sides, the flanges along the entrance sides being disposed a greater distance from the point of application of the spring pressure` than the flanges along the other side.

JOHN J. KAUFMANN, JR. 

